What is your actual beef here?
Have you come across a boat built to and sailing under a Classification Societies Rules where the E.R. Ventilation is only done by Fan and the OP is pushed out by the incoming air charge not with any direct mechanical assistance?
I certainly wouldn't want to open and close the Engine Room too many times with that set up!
Have you come across a boat built to and sailing under a Classification Societies Rules where the fuel was drawn direct to the engines from main storage tanks? ( I am not talking about point and squirt of plastic fantastics here)
I do know of a Classed 58m Yacht where the Day Tanks are located in the hull under and slightly forward of the Generators, they have had a lot of trouble in the early days with losing prime and air in the system.